On computers if you look at the background dirt, there is a little line on both sides that ruins the illusion that the dirt is seamless. We believe this does not happen with dark mode and blackstone. Also, the background dirt is inconsistent with the menu bar dirt.

Some minor suggestions, make diamond/heart/emerald/etc. have the newer textures, and the globe area up top (not the logo) have new biome and mob references, like cherry biomes and bumblebees. There could be flag icons to show where you were born. Maybe update Batty to be the 1.20.3 texture and model if you'd like.